Vapi hits $500M valuation after Amazon Ring picks it over 40 AI-voice rivals

AI voice startup Vapi reached a $500M valuation after Amazon's Ring selected it over 40 competitors. Vapi says enterprise revenue has grown 10x since early 2025 as companies shift support and sales calls to AI agents. The deal lands the same week Thinking Machines previewed its 'interaction model' targeting GPT Realtime 2 and Gemini Live — putting voice-agent infrastructure squarely in the frontier-vs-platform conversation.